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    <title>clGetCommandQueueInfo</title>
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    <div class="refentry">
      <a id="id-1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clGetCommandQueueInfo"></a>
        <h1>clGetCommandQueueInfo</h1>
        <p>Query information about a command-queue.</p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="scalarDataTypes.html" target="_top">cl_int</a> <strong class="fsfunc">clGetCommandQueueInfo</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_command_queue</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_command_queue_info" target="_top">cl_command_queue_info</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_name</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_value_size</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value_size_ret</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="parameters"></a>
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <code class="varname">command_queue</code>
              </span>
            </dt>
            <dd>
              <p>Specifies the command-queue being queried.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">param_name</code>
              </span>
            </dt>
            <dd>
              <p>Specifies the information to query.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">param_value_size</code>
              </span>
            </dt>
            <dd>
              <p>Specifies the size in bytes of memory pointed to by <code class="varname">param_value</code>. This size must be greater than or equal to the size of return type as described in the table below. If <code class="varname">param_value</code> is NULL, it is ignored.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">param_value</code>
              </span>
            </dt>
            <dd>
              <p>A pointer to memory where the appropriate result being queried is returned. If <code class="varname">param_value</code> is NULL, it is ignored.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">param_value_size_ret</code>
              </span>
            </dt>
            <dd>
              <p>Returns the actual size in bytes of data being queried by <code class="varname">param_value</code>. If <code class="varname">param_value_size_ret</code> is NULL, it is ignored</p>
            </dd>
            <dt>
              <span class="term"></span>
            </dt>
            <dd>
              <p>
                    The list of supported <code class="varname">param_name</code> values and the information returned in <code class="varname">param_value</code> by <code class="function">clGetCommandQueueInfo</code> is described in the table below.
                </p>
              <div class="informaltable">
                <table border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_command_queue_info</th>
                      <th align="left">Return Type and Information returned in param_value</th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_CONTEXT</code>
                      </td>
                      <td align="left">Return type: cl_context
            <p>Return the context specified when the command-queue is created.</p></td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_DEVICE</code>
                      </td>
                      <td align="left">Return type: cl_device_id
            <p>Return the device specified when the command-queue is created.</p></td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_REFERENCE_COUNT</code>
                      </td>
                      <td align="left">Return type: cl_uint
            <p>Return the command-queue reference count.</p>
            <p>
            The reference count returned with <code class="constant">CL_QUEUE_REFERENCE_COUNT</code> should be considered immediately stale. It is unsuitable for general use in applications. This feature is provided for identifying memory leaks.
        </p></td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_QUEUE_PROPERTIES</code>
                      </td>
                      <td align="left">Return type: cl_command_queue_properties
            <p>Return the currently specified properties for the command-queue. These properties are specified by the properties argument in <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>.</p></td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
It is possible that a device(s) becomes unavailable after a context and command-queues that use
this device(s) have been created and commands have been queued to command-queues. In this
case the behavior of OpenCL API calls that use this context (and command-queues) are
considered to be implementation-defined. The user callback function, if specified, when the
context is created can be used to record appropriate information in the <code class="varname">errinfo</code>, <code class="varname">private_info</code> arguments passed to the callback function when the device becomes unavailable.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>Returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully. Otherwise, it returns the following:</p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc">
            Returns <span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code> is not a valid command-queue.
        </li>
            <li class="listitem" style="list-style-type: disc">
            Returns <span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">param_name</code> is not one of the supported values or if size 
            in bytes specified by <code class="varname">param_value_size</code> is less than size of return type and <code class="varname">param_value</code> is not a NULL value.
        </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate resources required by the OpenCL implementation on the device.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate resources required by the OpenCL implementation on the host.
            </li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p><img src="pdficon_small1.gif" />
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf#page=53" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>, 
            <a class="citerefentry" href="clReleaseCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clReleaseCommandQueue</span></span></a>, 
            <a class="citerefentry" href="clRetainCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clRetainCommandQueue</span></span></a>, 
            <a class="citerefentry" href="clSetCommandQueueProperty.html"><span class="citerefentry"><span class="refentrytitle">clSetCommandQueueProperty</span></span></a>         
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4>
            Copyright © 
    Copyright © 2007-2010 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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